Evolution of the Surface Quality in the High Speed Milling of Aerospace Aluminum Alloys
In aerospace industry, aluminum alloys are traditionally used in a high number of structural elements. Many of these components require to be machined before acquiring their final shape in a hydroforming process. These workpieces, with high surface quality requirements, are obtained
in High Performance Cutting processes (HPC), with high production rates and low processing times. In this sense, to give response to all these requirements, High Speed Machining (HSM) is usually used. This work reports on the results derived from an experimental study of the evolution of the
surface quality, measured through R
a
(roughness average) parameter as a function of machining time in the HSM of aerospace UNS A92024-T3 (Al–Cu–Mg) stacks. A surface quality improvement with the machining time has been detected. This fact has been associated
to the secondary adhesion wear mechanism (Built-Up Edge and Built-Up Layer) which provokes a favourable modification in the cutting tool geometry. A smoothing of the workpiece surface by the transfer of material from BUE to the sample has been observed and it has been considered as the main
responsible of the R
a
decreasing.
Document Type: Research Article
Publication date: 01 February 2013
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